#pragma once

#include <iostream>
#include <memory>
#include <sys/epoll.h>
#include "socket.hpp"
#include "epoller.hpp"

using namespace std;

uint32_t EVENT_IN = (EPOLLIN);
uint32_t EVENT_OUT = (EPOLLOUT);

class EpollServer
{
    static const int num = 64;

public:
    EpollServer(uint16_t port)
        : _port(port),
          _listsocket_ptr(new Sock()),
          _epoller_ptr(new Epoller())
    {
    }

    void Init()
    {
        _listsocket_ptr->Socket();
        _listsocket_ptr->Bind(_port);
        _listsocket_ptr->Listen();
    }

    void Accepter()
    {
        // 获取了一个新连接
        string clientip;
        uint16_t clientport;
        int sock = _listsocket_ptr->Accept(clientip, clientport);
        if (sock > 0)
        {
            // 我们能直接读取吗？不能
            _epoller_ptr->EpllerUpdate(EPOLL_CTL_ADD, sock, EVENT_IN);
            
			cout<<"get a new link"<<endl;
        }
    }
    
    void Recver(int fd)
    {
        
        char buffer[1024];
        ssize_t n = read(fd, buffer, sizeof(buffer) - 1); 
        if (n > 0)
        {
            buffer[n] = 0;
            std::cout << "get a messge: " << buffer << std::endl;
            // wrirte
            std::string echo_str = "server echo $ ";
            echo_str += buffer;
            write(fd, echo_str.c_str(), echo_str.size());
        }
        else if (n == 0)
        {
           cout<< "client quit, me too"<<endl;;
            //细节3
            _epoller_ptr->EpllerUpdate(EPOLL_CTL_DEL, fd, 0);
            close(fd);
        }
        else
        {
           cout<<"read false"<<endl;
            _epoller_ptr->EpllerUpdate(EPOLL_CTL_DEL, fd, 0);
            close(fd);
        }
    }

    void Dispatcher(struct epoll_event revs[], int num)
    {
        for (int i = 0; i < num; i++)
        {
            uint32_t events = revs[i].events;
            int fd = revs[i].data.fd;
            if (events & EVENT_IN)
            {
                if (fd == _listsocket_ptr->Getlistensockfd())
                {
                    Accepter();
                }
                else
                {
                    // 其他fd上面的普通读取事件就绪
                    Recver(fd);
                }
            }
            else if (events & EVENT_OUT)
            {
            }
            else
            {
            }
        }
    }
    void Start()
    {
        // 将listensock添加到epoll中 -> listensock和他关心的事件，添加到内核epoll模型中rb_tree.
        _epoller_ptr->EpllerUpdate(EPOLL_CTL_ADD, _listsocket_ptr->Getlistensockfd(), EVENT_IN);
        struct epoll_event revs[num];
        for (;;)
        {
            int n = _epoller_ptr->EpollerWait(revs, num);
            if (n > 0)
            {
                // 有事件就绪
               cout<<"event happened"<<endl;
                Dispatcher(revs, n);
            }
            else if (n == 0)
            {
                cout<<"time out"<<endl;;
            }
            else
            {
                cout<<"epll wait error"<<endl;
            }
        }
    }
    ~EpollServer()
    {
        _listsocket_ptr->Close();
    }

private:
    std::shared_ptr<Sock> _listsocket_ptr;
    std::shared_ptr<Epoller> _epoller_ptr;
    uint16_t _port;
};